1311646639 has 2 divisors, whose sum is σ = 1311646640. Its totient is φ = 1311646638.

The previous prime is 1311646613. The next prime is 1311646643. The reversal of 1311646639 is 9366461131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311646639 - 2¹⁷ = 1311515567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311646439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655823319 + 655823320.

It is an arithmetic number, because the mean of its divisors is an integer number (655823320).

Almost surely, 2^1311646639 is an apocalyptic number.

1311646639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311646639 is an equidigital number, since it uses as much as digits as its factorization.

1311646639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 1311646639 is about 36216.6624497620. The cubic root of 1311646639 is about 1094.6424439497.

The spelling of 1311646639 in words is "one billion, three hundred eleven million, six hundred forty-six thousand, six hundred thirty-nine".